// Copyright 2006 Bret Taylor
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.

#include <iostream>
#include <set>
#include <string>

using std::ostream;
using std::set;
using std::string;

namespace indie {

class Debug {
  public:
    static inline Debug& instance() {
	static Debug debugger(std::cerr);
	return debugger;
    }

    inline ostream& stream() {
	return stream_;
    }

    void EnableKey(const char* key) {
	keys_.insert(key);
    }

    bool KeyIsEnabled(const char* key) {
	return (keys_.find(key) != keys_.end());
    }

  private:
    Debug(std::ostream& stream) : stream_(stream) {
    }

    ostream& stream_;
    set<string> keys_;
};

#define debug(KEY) \
  if (Debug::instance().KeyIsEnabled(#KEY)) Debug::instance().stream()

}
